From FishBase - here is the science.
http://fishbase.org/TrophicEco/FoodItems...pecies=promelasFood items reported for Pimephales promelas
n = 18
Food I
Food II
Food III
Food name
Country
Predator Stage
zoobenthos benth. crust. n.a./other benth. crustaceans Bosmina USA juv./adults
zoobenthos other benth. invertebrates n.a./other benth. invertebrates Bryozoan statoblasts Canada adults
zoobenthos insects insects Chaoborus sp. Canada adults
zoobenthos worms n.a./other annelids cocoons of annelida Canada adults
zoobenthos benth. crust. n.a./other benth. crustaceans Daphnia sp. USA juv./adults
zoobenthos benth. crust. amphipods Hyalella sp. USA juv./adults
detritus detritus debris unidentified USA adults
plants other plants benthic algae/weeds unidentified USA adults
zoobenthos insects insects unidentified USA adults
zooplankton other plank. invertebrates n.a./other plank. Invertebrates unidentified USA adults
zoobenthos benth. crust. amphipods unidentified amphipods Canada adults
zoobenthos insects insects unidentified chironomids Canada adults
zooplankton plank. crust. cladocerans unidentified cladocerans USA juv./adults
zooplankton plank. crust. cladocerans unidentified cladocerans Canada adults
zooplankton plank. crust. plank. copepods unidentified copepods Canada adults
zoobenthos benth. crust. n.a./other benth. crustaceans unidentified crustaceans USA juv./adults
zoobenthos mollusks n.a./other mollusks unidentified mollusks Canada adults
zoobenthos benth. crust. ostracods unidentified ostracods Canada adults